A. Hand washing only (just a guess )
The study of the functions of a structure is known as physiology.
C. 39% Divide the number of calories from fat by total number of calories.
It depends on which drug is to be given and what is its mechanism of action. e.g. for any antibiotic intra venous route will be a suitable choice whereas in case of a laxative we can administer it rectally if oral is not tolerated.
thanks
7000 chemicals. ..........
